Double-decker lift installation

ABSTRACT

An elevator has an elevator car supporting frame that can travel in a travel space provided for a journey of the elevator car supporting frame. The elevator installation is also provided with a first elevator car and a second elevator car arranged on the elevator car supporting frame. Furthermore, a hydraulic moving element is arranged in a lower end region of the travel space. In this way, the first elevator car can be moved in relation to the second elevator car, by the moving device, in the lower end region of the travel space.

FIELD

The invention relates to an elevator system having at least one elevatorcar support that can hold two or more elevator cars. The inventionrelates specifically to the field of elevator systems designed asso-called double-decker elevator systems.

BACKGROUND

JP 10-236753 A discloses a double-decker elevator. The known elevatorhas two cars which are arranged one above the other in a car frame. Thetwo cars can hereby move relative to each other. For this purpose,hydraulic cylinders are arranged in a counterweight frame. A tractioncable which is connected at one end to the counterweight frame and atthe other end to the car frame is guided over a drive pulley. Moreover,a second cable in addition to the traction cable is guided over afreewheeling pulley and is connected at one end to the hydrauliccylinders and at the other end to one of the cars. When the hydrauliccylinders actuate the second cable, the cars are moved relative to eachother.

The double-decker elevator known from JP 10-236753 A has thedisadvantage that it has a complex design. On the one hand, the designof the counterweight frame is complex because the hydraulic cylindersmove with the counterweight frame through the elevator shaft, whichrequires an additional control means. Moreover, a cable guide for thesecond cable is additionally needed. Elongation or shortening of thetraction cable and the second cable, occurring during operation, arehereby also possible, which results in undesired relative movementbetween the two elevator cars.

SUMMARY

An object of the invention is to provide an elevator system which has animproved structure. Specifically, an object of the invention is toprovide an elevator system that permits relative movement between atleast two elevator cars with a relatively low degree of complexity.

The elevator system is thus with at least one elevator car support whichdisplaceable in a travel space provided for the travel of the elevatorcar support. A first elevator car is arranged the on the elevator carsupport. At least a second elevator car is additionally arranged on theelevator car support. An adjusting device is arranged in a lower endregion of the travel space, it being possible to adjust the firstelevator car in the lower end region of the travel space relative to thesecond elevator car in the direction of travel using the adjustingdevice.

In the design of the elevator system, the elevator car support can bearranged in an elevator shaft that defines the travel space, a drivemotor unit being provided which serves to actuate the elevator carsupport. As a result, the elevator car support can be displaced alongthe travel path provided. The elevator car support can hereby besuspended from a traction means connected to the elevator car support.The traction means can hereby be guided in a suitable fashion over adrive pulley of the drive motor unit. As well as having the function oftransmitting the force or the torque from the drive motor unit to theelevator car support in order to actuate the elevator car support, thetraction means can here also have the function of carrying the elevatorcar support. Actuation of the elevator car support is hereby understoodin particular as raising or lowering the elevator car support, it beingpossible for the elevator car support to be guided by one or more guiderails.

It is advantageous that the first elevator car can be fixed with respectto the second elevator car, and that the first elevator car can beunfixed with respect to the second elevator car in the lower end regionof the travel space. It is also hereby advantageous that the elevatorcar support comprises a first elevator car support part and a secondelevator car support part, that the first elevator car is connected tothe first elevator car support part, that the second elevator car isconnected to the second elevator car support part, and that a connectingand locking device is provided which connects the first elevator carsupport part to the second elevator car support part in the closed stateand disconnects them in the open state. In the closed state, theelevator car support with the two elevator cars can be displaced throughthe travel space, a constant distance being maintained between theelevator cars. For example, upper floors situated one above the othercan each have the same inter-floor distance. As a result, in the closedstate, people can enter and leave both elevator cars on the respectivefloors. A basement or a lobby may, for example, be located in the lowerend region of the travel space. Disconnecting the two elevator carsupport parts can hereby adjust the two elevator cars relative to eachother. In the open state, the first elevator car can hereby inparticular be lowered and positioned. People can then enter and leaveboth elevator cars according to the floor to which they have moved. Thefirst elevator car with the first elevator car support part can then beraised again. The connecting and locking device can then reconnect thetwo elevator car support parts.

It is hereby also advantageous that the connecting and locking devicehas at least one connecting element that interacts in the closed statewith a connection point of the first elevator car support and/or with aconnection point of the second elevator car support part. The connectingelement can, for example, have a bar-like design and in the closed statebe guided through bores which are formed in the elevator car supportparts. In order to disconnect the elevator car support parts, theconnecting element can be withdrawn from the through bores so that theopen state is assumed.

It is moreover advantageous that the connecting and locking device isarranged on the second elevator car support part. The adjusting deviceadvantageously serves to adjust the first elevator car support part withthe first elevator car. By arranging the connecting and locking deviceon the second elevator car support part, the load on the adjustingdevice is removed as the weight of the connecting and locking device inthe open state then does not act on the first elevator car support part.

A braking and/or retaining device is advantageously provided that servesto fix the second elevator car in the travel space when the firstelevator car is adjusted relative to the second elevator car. The secondelevator car can, for example, hereby be fixed via the second elevatorcar support part. It is hereby also advantageous that the braking and/orretaining device interacts with an elevator shaft and/or with a guiderail. The braking and/or retaining device for fixing the second elevatorcar in the travel space can thus interact with a building structure orthe like. When the two elevator cars are disconnected, only the weightof the second elevator car and possibly other components connected tothe second elevator car, in particular the second elevator car support,acts on the traction means. The load on the traction means is therebyremoved at one end. However, the load of for example a counterweight isapplied to the traction means at the other end, so that the differentialforce is present at the drive pulley. This means that the drive pulleymust be designed accordingly, so that the second elevator car is notdisplaced upwards through the elevator shaft. The second elevator carcan, however, be fixed by the braking and/or retaining device so that aforce equilibrium is achieved.

It is also advantageous that the adjusting device is designed as ahydraulic adjusting device. As a result, inter alia, comfortableoperation is enabled which is smooth and free of vibration.

It is moreover advantageous that the adjusting device is arranged in apit of an elevator shaft and/or that the adjusting device is connectedto a bottom of the elevator shaft. A simple design and advantageousalignment of the adjusting device are hereby possible. Specifically,compressive forces that occur can be reliably absorbed and a compressiveforce that acts in order to make adjustments can advantageously betransferred onto the first elevator car from the adjusting device.

It is moreover advantageous that the first elevator car and the secondelevator car have a minimum base distance in a ready-to-travel state inwhich the elevator car support can be displaced through the travelspace. The first elevator car can be lowered in a controlled fashion inthe lower end region of the travel space, as a result of which thedistance between the elevator cars increases with respect to the minimumbase distance. After people have entered and left the elevator cars, thefirst elevator car can then be raised again until the minimum basedistance between the two elevator cars has been restored.

DESCRIPTION OF THE DRAWINGS

Preferred exemplary embodiments of the invention are explained in moredetail in the following description with the aid of the attacheddrawings, in which corresponding elements are provided with matchingreference numerals. In the drawings:

FIG. 1 shows a schematic representation of an elevator system inaccordance with a first exemplary embodiment of the invention in aclosed state of a connecting and locking device, and

FIG. 2 shows the elevator system shown in FIG. 1 in an open state of theconnecting and locking device.

DETAILED DESCRIPTION

FIG. 1 shows an elevator system 1 having at least one elevator carsupport 2 that can be displaced in a travel space 3 provided for thetravel of the elevator car support 2. The travel space 3 is provided inan elevator shaft 4 of a building. Several floors 5, 6 are provided,which represent stopping points 5, 6. The floors 5, 6 are hereby the twolowest floors of the elevator system 1. There are usually a largernumber of other floors or stopping points above the floors 5, 6.

In this exemplary embodiment, the elevator car support 2 has a firstelevator car support part 7 and a second elevator car support part 8.The elevator car support 2 has sheaves 9, 10 which are attached to thesecond elevator car support part 8. A traction means 11 is guided aroundthe sheaves 9, 10. The traction means 11 moreover runs around a drivepulley 12 of a drive motor unit 13. According to the current directionof rotation of the drive pulley 12 driven by the drive motor unit 13,the elevator car support 2 is displaced upwards or downwards through thetravel space 3. The elevator car support 2 with the two elevator carsupport parts 7, 8 can thus travel through the travel space 3.

The elevator car support 2 holds a first elevator car 15 and a secondelevator car 16. The first elevator car 15 is hereby arranged on thefirst elevator car support part 7 and connected to it. Moreover, thesecond elevator car 16 is arranged on the second elevator car supportpart 8 and connected to it. The first elevator car 15 has an exit level17. The second elevator car 16 also has an exit level 18. A distance 19is defined between the two exit levels 17, 18. In the base positionshown in FIG. 1, a minimum base distance 20 between the two elevatorcars 15, 16 is provided, so that the distance 19 is also minimal. Thedistance 19 is hereby set to the usual distance between floors that isneeded for the higher-situated floors. The distance 19 is, however,smaller than an inter-floor distance 21 between the floors 5, 6 whichare the lowest floors.

In order to move to the floors 5, 6, the elevator car support 2 is movedto a lower end region 22 by corresponding actuation of the drive pulley12 in such a way that the exit level 18 of the second elevator car 16 ispositioned at the floor 6. In this position of the elevator car support2, shown in FIG. 1, the exit level 17 of the first elevator car 15 is,however, situated above the floor 5 because the distance 19 is smallerthan the inter-floor distance 21.

When the second elevator car 16 stops at the floor 6, the first elevatorcar 15, which is arranged in the first elevator car support part 7, issituated in the lower end region 22 of the travel space 3. The elevatorshaft 4 has a pit 23 below the second elevator car support part 8. Ahydraulic adjusting element 24, which has a cylinder 25 and a piston,guided in the cylinder 25, with a piston rod 26, is arranged in the pit23. The piston rod 26 can hereby be adjusted upwards in a direction 27or downwards in a direction 28. In the position of the elevator carsupport 2 which has been shown, the piston rod 26 has been adjustedupwards in the direction 27 until a plate-Vice end piece 29 connected tothe piston rod 26 bears against the underside 30 of the first elevatorcar support part 7. The plate-like end piece 29 can hereby also alreadybe positioned in this position so that the elevator car support 2travels as far as the plate-like end piece 29.

The elevator system 1 has a connecting and locking device 35. Theconnecting and locking device 35 is arranged on the elevator car support2. In this exemplary embodiment, the connecting and locking device 35 isarranged on the second elevator car support part 8 and connected to thesecond elevator car 16. Moreover, the elevator system 1 has a brakingand/or retaining device 36 for the second elevator car 16. The brakingand/or retaining device 36 in this exemplary embodiment is herebyconnected to the second elevator car support part 8. A guide rail 37, onwhich the elevator car support 2 is guided in a suitable fashion, isarranged in the elevator shaft 4. Specifically, guidance duringactuation by the drive motor unit 13 is ensured thereby. Moreover, thetwo elevator car support parts 7, 8 can each be guided independently onthe guide rail 37. Further guide rails can hereby also be provided. Thebraking and/or retaining device 36 interacts with the guide rail 37. Thebraking and/or retaining device 36 hereby ensures that the secondelevator car 16, which is arranged in the second elevator car supportpart 8, is fixed to the guide rail 37 and thus relative to the travelspace 3.

The design of the elevator system 1 is described in more detail belowwith reference to FIG. 2.

FIG. 2 shows the elevator system 1 of the exemplary embodiment, when theconnecting and locking device 35 is in an open state and when thebraking and/or retaining device 36 is in an activated state. Incontrast, FIG. 1 shows the elevator system, when the connecting andlocking device 35 is in a closed state and when the braking and/orretaining device 36 is in a deactivated state.

When the first elevator car 15 is supported on the hydraulic adjustingelement 24 via the first car support part 7, the braking and/orretaining device 36 is actuated, The unactuated state of the brakingand/or retaining device 36 is hereby shown in FIG. 1 and the actuatedstate in FIG. 2. A pair of brake shoes of the braking and/or retainingdevice 36 hereby interacts with the guide rail 37, for example. As aresult, the second elevator car support part 8 is fixed to the secondelevator car 16 immovably in the travel space 3.

The connecting and locking device 35 has connecting elements 38, 39. Inthe closed state, the connecting elements 38, 39 are extended so thatthey connect the elevator car support parts 7, 8 together. Theconnecting element 38 hereby interacts with the first elevator carsupport part 7 at a connection point 40, and with the second elevatorcar support part 8 at a connection point 41. Through bores can, forexample, hereby be provided at the connection points 40, 41 in theelevator car support parts 7, 8, into which through bores the connectingelement 38 engages. In a corresponding fashion, connection points 42, 43are also provided on the elevator car support parts 7, 8 for theconnecting element 39. In the closed state, the connecting element 39interacts with the connection points 42, 43. When the braking and/orretaining device 36 is activated, the connecting and locking device 35is switched into the open state, the connecting elements 38, 39 beingretracted. The retracted state is illustrated in FIG. 2. The elevatorcar support parts 7, 8 are disconnected as a result. The piston rod 26with the plate-like end piece 29 then moves downwards in the direction28. This is achieved by the controlled draining of a pressurized fluidfrom the cylinder 25. The first elevator car support part 7 hereby movesdownwards with the first elevator car 15. The distance 19 herebyincreases. When the distance 19 is the same as the inter-floor distance21, the first elevator car support part 7 with the first elevator car 15stops. The exit level 17 of the first elevator car 15 is now situated atthe floor 5. A distance 44 between the elevator cars 15, 16 has herebyincreased with respect to the minimum base distance 20.

In the situation shown in FIG. 2, people can enter and leave the twoelevator cars 15, 16 from the respective floor 5, 6 to which they havemoved. It is thus also possible for people to enter and leave the twoelevator cars 15, 16 at the same time in the case of the inter-floordistance 21 which differs from the usual inter-floor distance of theother floors in the elevator shaft 4.

After people have entered and left the elevator cars 15, 16, the pistonrod 26 is adjusted in the direction 27. This is achieved by feedingpressurized fluid into the cylinder 25 by means of a pump. The distance44 hereby decreases. When the distance 44 has reached the minimum basedistance 20, the connecting and locking device 35 is actuated in orderto connect the two elevator car support parts 7, 8 together via theconnecting elements 38, 39. The braking and/or retaining device 36 isthen deactivated. The situation shown in FIG. 1 then reoccurs. The wholeelevator car support 2 with the two elevator cars 15, 16 can then bedisplaced through the travel space 3 by the drive motor unit 13. The twoelevator cars 15, 16 are then moved to their destination floors. Theminimum base distance 20 between the elevator cars 15, 16 is herebypredetermined in such a way that the distance 19 then corresponds againto the usual inter-floor distance. As a result, people may also enterand leave both elevator cars 15, 16 at the same time at the otherfloors.

Because the connecting and locking device 35 is arranged on the secondelevator car support part 8, its mass or its weight does not need to bemoved or raised by the hydraulic adjusting element 24. The same appliesfor the braking and/or retaining device 36 attached to the secondelevator car support part. As a result, the design of the hydraulicadjusting element 24 can be optimized. This also affects othercomponents, in particular a pump. On the other hand, the hydraulicadjusting element 24 is arranged immovably in the pit 23 so that themass of the hydraulic adjusting element 24 does not need to be moved bythe drive motor unit 13.

The hydraulic adjusting element 24 is connected to a base 45 of the pit23. As a result, forces are transmitted advantageously, because thepiston rod 26 is oriented parallel to the direction in which the weightof the first elevator car support part 7 with the first elevator car 15acts. In this exemplary embodiment, the hydraulic adjusting element 24forms a hydraulic adjusting device 24. Depending on the design of theelevator system 1, multiple hydraulic adjusting elements 24 can also beprovided for forming the hydraulic adjusting device 24.

The two elevator cars 15, 16 can thus have a minimum base distance 20 ina ready-to-travel state in which the elevator car support 2 can movethrough the travel space 3. In the unlocked state, in which the elevatorcar support parts 7, 8 are disconnected, a distance 44 between theelevator cars 15, 16 can be achieved that is greater than the minimumbase distance 20. The second elevator car 16 can hereby be fixed by thebraking and retaining device 36. The first elevator car 15 can beadjusted with a high degree of efficiency. The adjustment by means ofthe hydraulic adjusting element 24 has minimal vibration and is verysmooth. A high degree of comfort is achieved as a result.

The invention is not limited to the exemplary embodiments described.

In accordance with the provisions of the patent statutes, the presentinvention has been described in what is considered to represent itspreferred embodiment. However, it should be noted that the invention canbe practiced otherwise than as specifically illustrated and describedwithout departing from its spirit or scope.

The invention claimed is:
 1. An elevator installation has an elevatorcar support displaceable in a travel space provided for travel of theelevator car support, a first elevator car arranged on the elevator carsupport, and a second elevator car arranged on the elevator car support,comprising: an adjusting device arranged below a lower end region of thetravel space, wherein the adjusting device is a hydraulic adjustingdevice that includes a piston rod, a cylinder, and a pump, the pistonrod configured to move in two directions by means of the pump and apressurized fluid in the cylinder; and the first elevator car beingselectively movable relative to the second elevator car, when the secondelevator car is fixed in the travel space, wherein in the lower endregion of the travel space the piston rod of the adjusting deviceengages and moves the first elevator car relative to the second elevatorcar in a direction of travel of the elevator car support in the travelspace and the first elevator car is disengaged from the adjusting devicewhen the first elevator car is above the lower end region of the travelspace.
 2. The elevator system according to claim 1 wherein the elevatorcar support has a first elevator car support part and a second elevatorcar support part movable relative to the first elevator car supportpart, the first elevator car being connected to the first elevator carsupport part and the second elevator car being connected to the secondelevator car support part, and including a connecting and locking deviceconnecting the first elevator car support part to the second elevatorcar support part in a closed state and disconnecting the first elevatorcar support part from the second elevator car support part in an openstate.
 3. The elevator system according to claim 2 wherein theconnecting and locking device has at least one connecting element thatinteracts in the closed state with a connection point of at least one ofthe first elevator car support part and the second elevator car supportpart.
 4. The elevator system according to claim 2 wherein the connectingand locking device is arranged on the second elevator car support part.5. The elevator system according to claim 1 including a braking and/orretaining device positioned at the second elevator car that fixes thesecond elevator car in the travel space when the first elevator car isadjusted relative to the second elevator car.
 6. The elevator systemaccording to claim 5 wherein the braking and/or retaining deviceinteracts at least one guide rail.
 7. The elevator system according toclaim 1 wherein the adjusting device is arranged in a pit of an elevatorshaft.
 8. The elevator system according to claim 1 wherein the firstelevator car and the second elevator car have a minimum base distance ina ready-to-travel state in which the elevator car support can bedisplaced through the travel space.
 9. An elevator installationcomprising: an elevator car support displaceable in a travel spaceprovided for travel of the elevator car support, the elevator carsupport having a first elevator car support part and a second elevatorcar support part movable relative to the first elevator car supportpart; a first elevator car arranged on the first elevator car supportpart and a second elevator car arranged on the second elevator carsupport part; an adjusting device arranged below a lower end region ofthe travel space, wherein the adjusting device is a hydraulic adjustingdevice that includes a piston rod, a cylinder, and a pump, the pistonrod configured to move in two directions by means of the pump and apressurized fluid in the cylinder; and the first elevator car beingselectively movable relative to the second elevator car when the secondelevator car support part is fixed in the travel space and the firstelevator car support part is in the lower end region of the travelspace, wherein the first elevator car support part bears against theadjusting device permitting the adjusting device to move the firstelevator car relative to the second elevator car in a direction oftravel of the elevator car support in the travel space.
 10. An elevatorinstallation has an elevator car support displaceable in a travel spaceprovided for travel of the elevator car support, a first elevator cararranged on the elevator car support, and a second elevator car arrangedon the elevator car support above the first elevator car, comprising: anadjusting device arranged below a lower end region of the travel space,wherein the adjusting device is a hydraulic adjusting device thatincludes a piston rod, a cylinder, and a pump, the piston rod configuredto move in two directions by means of a pump and a pressurized fluid inthe cylinder; and the first elevator car being selectively movablerelative to the second elevator car, when the second elevator car isfixed in the travel space, wherein in the lower end region of the travelspace the adjusting device engages and moves the first elevator carrelative to the second elevator car in a direction of travel of theelevator car support in the travel space and the first elevator car isdisengaged from the adjusting device when the first elevator car isabove the lower end region of the travel space.